Question: Chapter 8, Section 2, Exercise 047 Consider the data with analysis shown in the following computer output: Level . N . Mean . StDev A

Chapter 8, Section 2, Exercise 047

Consider the data with analysis shown in the following computer output:

Level . N . Mean . StDev

A . 6 86.378 5.265

B . 5 76.167 6.555

C . 6 80.000 9.230

D . 7 69.333 6.154

Source . DF . SS . MS . F . P

Groups . 3 987.32 329.11 6.83 0.002

Error 20 963.67 48.18

Total . 23 . 1950.99

What is the pooled standard deviation? What degrees of freedom are used in doing inferences for these means and differences in means?

Round your answer for the pooled standard deviation to two decimal places.

The pooled standard deviation is

.

degrees of freedom=

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